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Related Concept Videos

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Satellite stem cells or myosatellite cells are quiescent stem cells that Alexander Mauro first identified in 1961. These cells are located between the sarcolemma, the plasma membrane of muscle fibers, and the basal lamina, the connective tissue sheath covering it. These mononucleated cells are activated in response to muscle injury, can transform into myoblasts, and may form or repair muscle fibers. Myosatellite cells can provide additional myonuclei for muscle regeneration or return to a...
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Skeletal muscle cells, also called muscle fibers, are distinctly elongated, multi-nucleated, slender biological units. They are packed with specialized structures designed to facilitate their primary function, which is contraction.
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Skeletal muscles are composed of a bundle of muscle fibers and are attached to bones through tendons. Each skeletal muscle fiber is a single muscle cell. The sarcolemma, the plasma membrane of a skeletal muscle cell, consists of a lipid bilayer and glycocalyx that supports muscle fibers. The sarcolemma extends into the muscle cells to form tubular structures called transverse or T-tubules. Each side of the T-tubules consists of a membrane-bound structure called the sarcoplasmic reticulum,...
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De novo myogenesis, or the formation of muscle fibers, begins during the early embryonic stages. The skeletal muscle is formed from somites– blocks of embryonic cell layers. The somites are further divided into dermatomes, myotomes, sclerotomes, and syndetomes. Among these, the myotomes give rise to muscle fibers.
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Skeletal muscle is the most abundant type of muscle in the body. Tendons are the connective tissue that attaches skeletal muscle to bones. Skeletal muscles pull on tendons, which in turn pull on bones to carry out voluntary movements.
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Cardiac muscle, or myocardium, is a specialized type of muscle found exclusively in the heart. Its unique structural and functional characteristics enable the heart to perform its vital role of pumping blood throughout the body continuously and rhythmically. The cardiac muscle cells, or cardiomyocytes, possess an endomysium and perimysium but do not have an epimysium.
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Isolation, Culture, and Transplantation of Muscle Satellite Cells
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Activated Muscle Satellite Cells Chase Ghosts.

Philippos Mourikis1, Frédéric Relaix2

  • 1Inserm, IMRB U955-E10, 94000, Créteil, France; Université Paris Est Créteil, Faculté de Médecine, 94000, Créteil, & Ecole Nationale Vétérinaire d'Alfort, 94700, Maisons-Alfort, France.

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Satellite cells, the stem cells of skeletal muscle, have poorly understood in vivo behaviors. New research reveals that "ghost fiber" remnants guide satellite cell divisions after muscle injury.

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Area of Science:

  • Muscle regeneration
  • Stem cell biology
  • Skeletal muscle physiology

Background:

  • The in vivo behavior of skeletal muscle stem cells, known as satellite cells, during normal function (homeostasis) and following injury remains largely unclear.
  • Understanding these behaviors is crucial for developing effective regenerative therapies.

Purpose of the Study:

  • To elucidate the in vivo dynamics of satellite cells during skeletal muscle regeneration.
  • To identify the structural and environmental cues that direct satellite cell activity post-injury.

Main Methods:

  • Intravital microscopy was employed to directly visualize satellite cell behavior in living tissue.
  • High-resolution imaging allowed for detailed observation of cell division and migration patterns.

Main Results:

  • Satellite cells were observed to utilize "ghost fiber" remnants as scaffolds after injury.
  • These remnants provide structural guidance, directing the orientation of satellite cell divisions.

Conclusions:

  • "Ghost fiber" remnants play a critical role in orchestrating satellite cell behavior during muscle repair.
  • This finding offers new insights into the mechanisms of skeletal muscle regeneration and satellite cell function.